Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:fs\buffer.c Create Date:2022-07-28 20:14:09
Last Modify:2020-03-18 10:38:29 Copyright©Brick
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Annotation kernel can get tool activityDownload SCCTChinese

Name:__getblk_gfp() will locate (and, if necessary, create) the buffer_head* which corresponds to the passed block_device, block and size. The* returned buffer has its reference count incremented.* __getblk_gfp() will lock up the machine if grow_dev_page's

Proto:struct buffer_head *__getblk_gfp(struct block_device *bdev, sector_t block, unsigned size, gfp_t gfp)

Type:struct buffer_head

Parameter:

TypeParameterName
struct block_device *bdev
sector_tblock
unsignedsize
gfp_tgfp
1358  bh = Perform a pagecache lookup for the matching buffer. If it's there, refresh* it in the LRU and mark it as accessed. If it is not present then return* NULL
1360  might_sleep()
1361  If (bh == NULL) Then bh = __getblk_slow(bdev, block, size, gfp)
1363  Return bh
Caller
NameDescribe
__bread_gfp__bread_gfp() - reads a specified block and returns the bh*@bdev: the block_device to read from*@block: number of block*@size: size (in bytes) to read*@gfp: page allocation flag* Reads a specified block, and returns buffer head that contains it